What is going to be the best way to handle my door weatherstripping? It's on a 47 cod and it had none when I got it, so I'm not sure what I need. I've looked all over and haven't found anything yet.

 

I think the windlace is what you are looking for. It is a round cord affair that fits more on the inside of the cab,
Like this
Stitched Cloth Headliner Windlace Ford Chrysler GM Light Blue Top Quality | eBay

 

There is also a hidem welt to fasten the windlace. Here is another source:
Search Results For: Windlace For All Years And Models Parts & Accessories

 

They never had weather strippiing, the windlace was it.

 

FYI if you are doing this correctly, make sure to stop by a good furniture re-upholster and pickup some small steel nails that hold the lace into the metal, the ones that are usually supplied are aluminum and don't work at all.

Here is a shot of an original set up